Patent GB-1009573-A (GB)
Title: Drilling machines of the spindle magazine type
Inventor: HOLZL HORST
IPC: B23B/
Filed: 1962-12-31
Abstract: 1,009,573. Drilling machine details. K. HULLER G.m.b.H. Dec. 31, 1962, No. 49003/62. Heading B3C. A magazine spindle drilling machine comprises a frame 12, Figs. 1 and 2, supported on a base 10, a preselector gear 14 driven by a motor 16 through a belt drive 18, a switch gear 20 for connection to a selected tool spindle 28, when the latter is in the working position, tool spindles 24 being removably arranged in a magazine 22 indexable to bring each spindle into the working position, a feed unit 32 for feeding the spindle 28, and a control panel 30. Magazine 22, Fig. 3, is displaceable longitudinally in holder 26 by a rack and pinion 70, 64 and is guided in the holder by rollers 44 and keeps 56, 58. Each spindle assembly comprises a spindle 28 rotatably mounted in a housing 94, Figs. 3, 5, 10, 8, strips 104, 106 on the housing having recesses 108, 110 for co-operation with spring- urged detents 80, 82, Fig. 15, in the housing for retaining the assembly in the housing, and grooves 112, 114, for engagement with guides 76, 78. When at the working position, each spindle 28 is driven through a claw coupling 116, which co-operates with a similar claw 118  on each spindle, claw 116 being controlled by a clutch 296. When a spindle assembly is in the working position, it is positioned by hydraulically actuated pins 138, 140, Fig. 3, and is clamped by spring-urged clamps 134, 136 actuated by hydraulic pistons 146, 148 having wedge faces 162 which co-operate with similar faces on the clamps. The feed of spindles 28 is controlled by a device 204, Fig. 3, comprising a fluid pressure actuated piston 206 which cooperates with an adjustable setting pin 210 on each housing 94. Fluid passes into a chamber 215 to move the piston into engagement with pin 210, and fluid passes through a slot 214, an annular groove 216, and thence to a piston 218, connected to feed unit 32. The spindle is moved to the workpiece at high speed, and is then slowed down to a working speed by a cut-off valve 234 actuated by an adjustable cam 228 carried by housing 94, and for limiting the depth of feed, an adjustable stop 236, Fig. 11, carried by housing 94, co-operates with a limit switch 36. When feed unit 32 has been fully retracted, a switch 237, Fig. 3, is actuated to stop the machine. Two sets of switches 200 are carried by a holder 180, Figs. 3, 12, and co-operate with two rows of setting pins 202, Fig. 6 (not shown), on each housing 94 to control rotation, feed, working depth, &c. of the spindle in the working station, the holder being axially movable by an hydraulic piston 182 secured thereto. Claw 116, Figs. 1 and 14, is carried by a splined shaft 284, driven from pre-selector gear 14 through a belt 18 and pulley 330 and pinion 64 is driven from sleeve 286 through gears 234, 338, electric clutch 342, and gears 346, 350, 352 and 68. An electric brake 354 is provided for stopping magazine 22 whenever a spindle is in the working position, and this occurs as a cam 356 on magazine 22, Fig. 10, actuates a switch 358. Control of the position of the magazine may be effected by a multi-cam switch 360, Fig. 3, co-operating with cams 362, one for each spindle, on the magazine. Fork clutch 296, Fig. 3, for controlling the engagement of claws 116, 118 is held in a position to hold the claws in engagement during feeding of the spindle by a pawl 314 which is disengaged at the fully retracted position of the spindle by a cam 326. In a modification, the drilling machine comprises a frame 402, Fig. 17, a base 400 carrying a vertically adjustable table 406, a pre-selected gear-box 408, a switch gear-box 410, and an annular spindle magazine 418, which is rotatable to bring any of the spindles into the working station.